README.txt The files: MARCELLUS_PSU_INSITU_CENTRAL_2015_59M.dat MARCELLUS_PSU_INSITU_NORTH_2015_46M.dat MARCELLUS_PSU_INSITU_EAST_2015_59M.dat MARCELLUS_PSU_INSITU_SOUTH_2015_61M.dat MARCELLUS_PSU_INSITU_CENTRAL_2016_59M.dat MARCELLUS_PSU_INSITU_NORTH_2016_46M.dat MARCELLUS_PSU_INSITU_EAST_2016_59M.dat MARCELLUS_PSU_INSITU_SOUTH_2016_61M.dat MARCELLUS_PSU_INSITU_CENTRAL_2017_59M.dat MARCELLUS_PSU_INSITU_EAST_2017_59M.dat MARCELLUS_PSU_INSITU_NORTH_2017_46M.dat MARCELLUS_PSU_INSITU_SOUTH_2017_61M.dat contain the calibrated CH4, delta13CH4, and CO2 data, averaged to 10-min segments. ________________________ CALIBRATION UPDATE (03/29/2021): The measured mole fraction was converted from traceable to the WMO X2007 scale (CO2) to WMO X2019 scale (CO2), following Hall et al. (2020) using the linear function: X2019=1.00079 * X2007 - 0.142 (ppm) CITATION: Hall, B. D., Crotwell, A. M., Kitzis, D. R., Mefford, T., Miller, B. R., Schibig, M. F., & Tans, P. P. (2020). Revision of the WMO/GAW CO 2 calibration scale. Atmospheric Measurement Techniques Discussions, 1-33. DOI: https://doi.org/10.5194/amt-2020-408 ________________________ *The above are the files that are recommended for use for most, if not all, applications.* For complete metadata, see http://www.datacommons.psu.edu/commonswizard/MetadataDisplay.aspx?Dataset=6134 The North, Central, and East towers were decommissioned in February 2017. This dataset therefore includes data from installation in May 2015 - February 2017. The South tower is currently operational as of April 2018 through the ACT-America project. The files in the directory "raw_data" are daily files from the instruments. These are 1-3 second frequency, uncalibrated. North: Picarro serial number FCDS2048. Flag = 1 indicates sample from tower. Calibration tanks are as follows: Flag CH4(ppm) delta13CH4(permil) CO2(ppm)_X2007 CO2(ppm)_X2019 2 CB10825 (NOAA/INSTAAR) 1867.59 -47.264 399.71 399.88 6 CA05551 (Scott-Marrin/PSU) 1926.8 -23.67 N/A N/A 3 CA06418 (Scott-Marrin/PSU) 9701 -38.31 N/A N/A South: Picarro serial number FCDS2046 (CFBDS2042 used for concurrent testing May-July 2016). Flag = 1 indicated sample from tower. Calibration tanks are as follows: Flag CH4(ppm) delta13CH4(permil) CO2(ppm)_X2007 CO2(ppm)_X2019 2 CB10727 (NOAA/INSTAAR) 1868.33 -47.241 399.68 399.85 3 CC114999 (Scott-Marrin/PSU) 1999.2 -23.72 N/A N/A 6 CA05330 (Scott-Marrin/PSU) 10152 -38.68 N/A N/A 16 CC339515 (NOAA) 1862.77 N/A 395.36 395.53 Central: Picarro serial number FCDS2047 (CFADS2401 used as temporary instrument July-December 2016). Flag = 1 indicates sample from tower. Calibration tanks are as follows: Flag CH4(ppm) delta13CH4(permil) CO2(ppm)_X2007 CO2(ppm)_X2019 2 CB10734 (NOAA/INSTAAR) 1878.53 -47.254 397.09 397.26 3* CA06438 (Scott-Marrin/PSU) 2064.6 -23.8 398.25 398.42 6 CA05419 (Scott-Marrin/PSU) 10534 -38.48 400.14 400.31 *On 13 July 2020, we replaced the rotary valve (has six options 1-6) with solenoid valves, so the flags are different after that date: CA06438 became flag 8 and we installed CC339515 with a flag of 16. East: Picarro serial number FCDS2049. Flag = 4 indicates sample from tower. Calibration tanks are as follows: Flag CH4(ppm) delta13CH4(permil) CO2(ppm)_X2007 CO2(ppm)_X2019 5 CB10718 (NOAA/INSTAAR) 1867.94 -47.264 399.67 399.84 3 CA06357 (Scott-Marrin/PSU) 2079.7 -24.02 N/A N/A 6 CA06410 (Scott-Marrin/PSU) 10414 -38.52 N/A N/A